Q39:Four long, parallel conductors carry equal currents of I = A. Figure P30.39 is an end view of the conduc- tors. The current direction is into the page at points A and B and out of the page at points C and D. Cal- culate
(a) the magnitude and
(b) the direction of the magnetic field at point P, located at the center of the square of edge length , l= m.
n =
pi =
g =
u =